Hannover 2010 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 10: Poster: Spectroscopy in He Droplets

MO 10.1: Poster

Dienstag, 9. März 2010, 16:00–18:30, Lichthof

Doping of helium nanodroplets from an alkali metal dispenser source — •Matthew Sievert, Barbara Grüner, Christian Giese, Lutz Fechner, Marcel Mudrich, and Frank Stiekemeier — Physikalisches Institut, Universität Freiburg, Germany

Helium nanodroplets have been employed as cryostats for molecules and clusters and therefore allow high resolution molecular spectroscopy. In studies of alkali metals, the droplets are doped when passing a heated cell providing a high vapor pressure of the required alkali atoms. Picking-up more than one alkali atom leads to subsequent formation of molecules on the surface of the helium nanodroplets. As an alternative to the widely used thermal evaporation in heated oven cells we are developing a dispenser device which provides higher flexibility: in one small device multiple alkali sources can be stored and activated in any combination. Moreover, handling and out-of-vacuum storage of dispensers is far less complex when compared to bulk alkali metals.